CN108465360B

CN108465360B - High-efficient denitration ammonia injection system

Info

Publication number: CN108465360B
Application number: CN201810306584.3A
Authority: CN
Inventors: 魏进超; 李俊杰; 康建刚
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2018-04-08
Filing date: 2018-04-08
Publication date: 2020-12-04
Anticipated expiration: 2038-04-08
Also published as: CN108465360A

Abstract

The utility model provides an ammonia system is spouted in high-efficient denitration, this system include adsorption tower, desorption tower, ammonia gas mixing arrangement, first active carbon conveyor, second active carbon conveyor, first pipeline, second pipeline. One side of the adsorption tower is provided with a flue gas inlet. The other side of the adsorption tower is provided with a flue gas outlet. The flue gas inlet is provided with a first ammonia spraying device. And a second ammonia spraying device is arranged at the lower part of the inner cavity of the adsorption tower. The first conveying pipeline is connected with the mixed gas outlet and the first ammonia spraying device. The second conveying pipeline is connected with the mixed gas outlet and the second ammonia spraying device. The first active carbon conveyer is used for connecting the discharge hole of the adsorption tower and the feed inlet of the desorption tower. The second active carbon conveyer is used for a discharge hole of the desorption tower and a feed inlet of the adsorption tower. According to the ammonia injection system provided by the invention, a small amount of ammonia gas is injected into the lower part of the adsorption tower and the rear part of the bed layer, so that the denitration efficiency can be increased, the utilization rate of the ammonia gas is improved, and the efficient utilization of the activated carbon is realized.

Description

High-efficient denitration ammonia injection system

Technical Field

The invention relates to an activated carbon method flue gas purification device, belongs to an activated carbon method flue gas purification device suitable for atmospheric pollution control, in particular to a high-efficiency denitration ammonia injection device for purifying sintering flue gas, and relates to the field of environmental protection.

Background

For industrial flue gas, especially for flue gas of sintering machine in steel industry, it is desirable to use desulfurization and denitrification apparatus and process comprising activated carbon adsorption tower and desorption tower. In a desulfurization and denitration apparatus including an activated carbon adsorption tower for adsorbing pollutants including sulfur oxides, nitrogen oxides, and dioxins from sintering flue gas or exhaust gas (particularly sintering flue gas of a sintering machine in the steel industry) and a desorption tower (or regeneration tower) for thermal regeneration of activated carbon.

The activated carbon desulfurization method has the advantages of high desulfurization rate, simultaneous realization of denitration, dioxin removal, dust removal, no generation of wastewater and waste residues and the like, and is a flue gas purification method with great prospect. The activated carbon can be regenerated at high temperature, and pollutants such as sulfur oxides, nitrogen oxides, dioxin and the like adsorbed on the activated carbon are rapidly resolved or decomposed (sulfur dioxide is resolved, and nitrogen oxides and dioxin are decomposed) at the temperature of more than 350 ℃. And the regeneration speed of the activated carbon is further increased and the regeneration time is shortened with the increase of the temperature, it is preferable to generally control the regeneration temperature of the activated carbon in the desorption tower to be equal to about 430 ℃, therefore, the ideal desorption temperature (or regeneration temperature) is, for example, in the range of 390-450 ℃, more preferably in the range of 400-440 ℃.

The function of the desorption tower is to adsorb SO on the activated carbon₂And the dioxin can be decomposed by more than 80 percent at the temperature of more than 400 ℃ and a certain retention time, and the activated carbon is cooled and screened for reuse. Released SO₂Can be used for preparing sulfuric acid, etc., and the desorbed active carbon is conveyed to an adsorption tower by a conveying device for adsorbing SO₂And NO_XAnd the like.

NO in adsorption and desorption columns_XReacting with ammonia to remove NO by SCR, SNCR, etc_X. The dust is adsorbed by the active carbon when passing through the adsorption tower, the vibrating screen at the bottom end of the desorption tower is separated, the active carbon powder under the screen is sent to an ash bin, and then the active carbon powder can be sent to a blast furnace or sintered to be used as fuel.

A conventional activated carbon denitration ammonia injection process is shown in fig. 1. Ammonia gas is directly sprayed into the whole flue gas inlet: SO in flue gas₂、NH₃After the activated carbon is contacted, sulfuric acid or sulfate is formed on the surface or in the gaps of the activated carbon, so that the activated carbon is poisoned, and the denitration activity is reduced. With the proceeding of the desulfurization and denitrification reaction, the activated carbon on the upper part of the tower, especially the front end of the activated carbon bed layer contacted with the flue gas, forms sulfuric acid or sulfate on the upper part of the tower, and when the activated carbon gradually moves to the lower part of the tower body, the part of the activated carbon basically loses the denitrification activity. Therefore, the ammonia injected in the prior art, most of SO adsorbed by the activated carbon₂React off to form H₂SO₄Or NH₄HSO₄The denitration effect is not obvious, NH₃The utilization efficiency is low.

In order to solve the problems, ammonia is sprayed only at the upper part of an activated carbon bed layer, and ammonia is not sprayed at the lower part, so that the lower activated carbon only depends on part of ammonia adsorbed and stored at the upper part of the bed layer for denitration, and although the ammonia spraying amount is reduced, the denitration efficiency is lower.

In addition, the dust is adsorbed by the activated carbon when passing through the adsorption tower, the vibrating screen at the bottom end of the desorption tower is separated, the activated carbon powder under the screen is sent to an ash bin, and the activated carbon powder left on the upper part of the screen is regarded as qualified activated carbon for recycling. The currently commonly used screen is in the form of a square hole, and the side length a of the square hole is determined according to the screening requirement and is generally about 1.2 mm. However, for similar sizes are

The tablet-shaped activated carbon was classified as a good product by sieving with this sieve. The tablet-shaped activated carbon has low wear-resistant and pressure-resistant strength, and can be easily broken into pieces after entering a flue gas purification system, so that on one hand, the flue gas purification system has large resistance due to the large amount of powder in an activated carbon bed layer, and the running cost of the system is increased; on the other hand, the high-temperature combustion risk of the activated carbon is increased, meanwhile, the dust in the outlet flue gas mainly consists of part of fine particles carried in the original flue gas and activated carbon powder newly entrained when the flue gas passes through an activated carbon bed layer, and the increase of the dust at the flue gas outlet can also be caused by more activated carbon bed layer powder, so that the surrounding environment is influenced, and the atmospheric pollution is caused.

In addition, the prior art activated carbon discharge device includes a circular roller feeder and a feeding rotary valve, as shown in fig. 8.

Firstly, for the circular roller feeder, in the working process of the circular roller feeder, activated carbon moves downwards under the control of the circular roller feeder under the action of gravity, the different rotating speeds of the circular roller feeder determine the moving speed of the activated carbon, the activated carbon discharged by the circular roller feeder enters the rotary feeding valve to be discharged and then enters the conveying equipment to be recycled, and the rotary feeding valve mainly has the function of keeping the sealing of the adsorption tower while discharging materials, so that harmful gas in the adsorption tower is not leaked into the air.

Because the flue gas contains certain water vapor and dust, a small amount of bonding phenomenon can be generated in the adsorption process of the activated carbon, and a block is formed to block a feed opening, as shown in fig. 9. If the feed opening is blocked seriously, the activated carbon can not move continuously, so that the adsorption saturation of the activated carbon is caused and the purification effect is lost, and even the high temperature of an activated carbon bed layer is caused by the heat storage of the activated carbon, so that great potential safety hazard exists. The current method of disposal is manual removal of the cake after system shut down. In addition, the circular roller feeder has faults in the production process, such as: the material leakage condition when the smoke pressure changes, the uncontrollable material when the vehicle stops, and the like. In addition, the circular roller feeder has the advantages of large number (as long as one circular roller feeder breaks down, the whole large-scale device is shut down), high manufacturing cost and difficult maintenance, thereby bringing certain limit to the development of the activated carbon technology.

Secondly, for the feed rotary valve of the prior art, the following problems exist: for the transportation of fragile particles such as the desulfurization and denitrification activated carbon, a rotary valve is used on one hand to ensure the air tightness of the tower body, and on the other hand, the nondestructive transportation of materials is realized, but if the transportation medium is sheared due to the rotation of blades in the transportation process of the rotary valve, see the attached figure 8, the operation cost of the system is increased. Meanwhile, the shearing phenomenon can cause valve body abrasion, air tightness is poor, and the service life is shortened. Especially when the feed inlet is full of materials, the shearing action of the blades and the valve shell on the conveyed medium is more obvious by rotating the valve core. For a large adsorption tower with a height of about 20 meters, the circular roller feeder or the rotary valve fails in the production process, which causes great loss to the continuous operation of the process, because the adsorption tower is filled with several tons of activated carbon, the manual removal and maintenance or reinstallation are quite difficult, and the influence and loss caused by the shutdown are difficult to imagine.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the efficient denitration ammonia injection system, a small amount of ammonia gas is injected into the lower part of the adsorption tower and the rear part of the bed layer, so that the denitration efficiency can be improved, the utilization rate of the ammonia gas is improved, and the efficient utilization of the activated carbon is realized.

According to a first embodiment of the invention, an efficient denitration ammonia injection system is provided.

The utility model provides an ammonia system is spouted in high-efficient denitration, this system include adsorption tower, desorption tower, ammonia gas mixing arrangement, first active carbon conveyor, second active carbon conveyor, first pipeline, second pipeline. One side of the adsorption tower is provided with a flue gas inlet. The other side of the adsorption tower is provided with a flue gas outlet. The flue gas inlet is provided with a first ammonia spraying device. And a second ammonia spraying device is arranged at the lower part of the inner cavity of the adsorption tower. The ammonia mixing device comprises an ammonia inlet, an air inlet and a mixed gas outlet. The first conveying pipeline is connected with the mixed gas outlet and the first ammonia spraying device. The second conveying pipeline is connected with the mixed gas outlet and the second ammonia spraying device. The ammonia inlet is connected with an ammonia delivery pipeline. The air inlet is connected with an air conveying pipeline or communicated with the atmosphere. The first active carbon conveyer is used for connecting the discharge hole of the adsorption tower and the feed inlet of the desorption tower. The second active carbon conveyer is used for connecting the discharge hole of the desorption tower and the feed inlet of the adsorption tower.

Preferably, the flue gas inlet is downstream of the flue gas inlet. The flue downstream of the flue gas inlet is divided into two layers. Respectively the upper part of the flue and the lower part of the flue. The first ammonia injection device is arranged in the upper part of the flue.

Preferably, a second ammonia spraying chamber is arranged in the adsorption tower. And in the vertical direction, the second ammonia spraying chamber is positioned at the lower part in the adsorption tower. Preferably, the second ammonia spraying chamber is close to one side of the smoke outlet in the horizontal direction.

Preferably, the side wall of the second ammonia spraying chamber is a porous plate. The second ammonia injection device is arranged in the second ammonia injection chamber.

Preferably, the height of the second ammonia spraying chamber is flush with the top of the lower part of the flue in the vertical direction, or the top of the second ammonia spraying chamber is lower than the top of the lower part of the flue.

Preferably, the first conveying pipeline is provided with a first control valve.

Preferably, the second conveying pipeline is provided with a second control valve.

Preferably, the second conveying pipe branches from the first conveying pipe. One end of the second conveying pipeline is connected with the first conveying pipeline, and the other end of the second conveying pipeline is connected with the second ammonia spraying device.

In the invention, the ammonia injection amount of the second ammonia injection device is 10-60%, preferably 20-50%, more preferably 25-40% of the ammonia injection amount of the first ammonia injection device.

In the invention, the mixed gas passing through the ammonia gas mixing device is conveyed into the adsorption tower through two paths. The first path of mixed gas is conveyed to a first ammonia spraying device at a flue gas inlet through a first conveying pipeline, and ammonia is sprayed at an original flue gas inlet. The partial ammonia gas mainly enters the upper layer of the adsorption tower and reacts with the active carbon on the upper layer of the adsorption tower, so that the effect of treating pollutants such as oxysulfide, nitric oxide, dioxin and the like is improved. And the second path of mixed gas is conveyed to a second ammonia spraying device at the lower part of the inner cavity of the adsorption tower through a second conveying pipeline, and ammonia is sprayed at the lower part of the adsorption tower and is directly sprayed in the adsorption tower. The partial ammonia gas completely enters the lower layer of the adsorption tower (preferably enters an activated carbon layer close to a flue gas outlet of the adsorption tower) and reacts with the activated carbon at the lower layer of the adsorption tower, so that the effect of treating pollutants such as oxysulfide, nitric oxide, dioxin and the like is improved.

In the present invention, the "connection" of the outlet of one device to the inlet of the other device means the manner of material transfer achieved by the two ends of the conveying device (e.g. conveyor or pipe). For example, material discharged from the discharge port of one device is conveyed by the conveying device to (into) the feed port of another device. Delivery devices described herein include, but are not limited to: a conveyor or a pipe.

In the present invention, the vertical direction means the height direction of the adsorption column, that is, the flow direction of the activated carbon in the adsorption column. The horizontal direction is the direction perpendicular to the height of the adsorption tower, namely the direction of the transverse flow of the flue gas in the adsorption tower.

In the invention, the second ammonia injection chamber is positioned in the inner chamber of the adsorption tower. The side of the second ammonia spraying chamber close to the flue gas outlet means that the distance between the second ammonia spraying chamber and the flue gas inlet is greater than the distance between the second ammonia spraying chamber and the flue gas outlet.

In the invention, the fact that the height of the second ammonia spraying chamber is flush with the top of the lower part of the flue means that the second ammonia spraying chamber is positioned at the lower part of the adsorption tower, and the height of the top of the second ammonia spraying chamber is the same as the height of the top of the lower part of the flue in the vertical direction. It is also possible that the top of the second ammonia injection chamber is lower than the lower top of the flue in the vertical direction. Typically, the top of the second ammonia injection chamber is 1-100cm, preferably 10-90cm, more preferably 30-70cm, below the top of the lower portion of the flue.

In the invention, a first control valve controls the flow of the mixed gas in the first conveying pipeline, namely controls the ammonia spraying amount of the first ammonia spraying device; the second control valve controls the flow of the mixed gas in the second conveying pipeline, namely controls the ammonia injection amount of the second ammonia injection device.

Preferably, there is one discharge round roller at the bottom of each chamber of the adsorption tower.

Preferably, the feed bin or bottom bin of the adsorption tower is provided with one or more blow-down rotary valves.

In all the desulfurization and denitrification systems of the present application, generally, a sieve-equipped vibrating screen or a multi-stage or multi-layer type vibrating screen (or referred to as a multi-stage sieving machine) is used below or downstream of the bottom discharge port of the desorption tower.

In order to avoid the entrapment of the tablet-shaped active carbon on the screen, the screen with rectangular or elongated screen holes is designed. The screen can be arranged on a vibrating screen to screen out the activated carbon particles meeting the requirements of the desulfurization and denitrification device.

Therefore, it is preferable to provide a screen having rectangular or oblong holes, the length L of the rectangular holes being not less than 3D, and the width a of the rectangular holes being 0.65h to 0.95h (preferably 0.7h to 0.9h, more preferably 0.73h to 0.85h), where D is the diameter of the circular cross section of the cylinder of activated carbon to be retained on the screen, and h is the minimum value of the length of the cylinder of granular activated carbon to be retained on the screen.

In particular, in order to overcome the problems of the prior art encountered in the desulfurization and denitrification apparatuses, it is generally required that the minimum value h of the length of the activated carbon cylinder is 1.5mm to 7 mm. For

example h

2, 4 or 6 mm.

D (or

) Depending on the specific requirements of the desulfurization and denitrification facility. Generally, D (or

) 4.5-9.5mm, preferably 5-9mm, more preferably 5.5-8.5mm, more preferably 6-8mm, for example 6.5mm, 7mm or 7.5 mm.

The adsorption column generally has at least 2 activated carbon compartments.

Preferably, a circular roller feeding machine or a circular roller discharging machine (G) is arranged at the bottom of each active carbon material chamber of the adsorption tower. For the discharge roller (G) described here, it is possible to use a discharge roller of the prior art. However, it is preferable that, instead of the round roll feeder or the discharge round roll (G), a new star wheel type activated carbon discharge device (G) may be used, which includes: the star wheel type active carbon discharging roller is positioned below a discharging opening formed by the front baffle and the rear baffle and the two side plates at the lower part of the active carbon material chamber; wherein the star wheel type active carbon discharging roller comprises a round roller and a plurality of blades which are distributed along the circumference of the round roller at equal angles or basically at equal angles. More specifically, a novel star wheel type active carbon discharging roller is used below a discharging opening formed by a front baffle plate, a rear baffle plate and two side plates at the lower part of an active carbon material chamber.

The star wheel type active carbon discharging roller is in star wheel type configuration or appearance when viewed from the cross section of the star wheel type active carbon discharging roller.

The star wheel type active carbon blanking device mainly comprises a front baffle plate and a rear baffle plate of an active carbon discharge port, two side plates, blades and a round roller. Preceding baffle and backplate are fixed to be set up, leave the active carbon unloading passageway between preceding baffle and the backplate, and the bin outlet promptly, this bin outlet comprises preceding baffle, backplate and two curb plates. The round roller is arranged at the lower ends of the front baffle and the rear baffle, the blades are uniformly distributed and fixed on the round roller, the round roller is driven by the motor to rotate, and the rotating direction is towards the front baffle from the rear baffle. The angle or pitch between the blades must not be too large, and the angle theta between the blades is generally designed to be less than 64 deg., for example 12-64 deg., preferably 15-60 deg., preferably 20-55 deg., more preferably 25-50 deg., more preferably 30-45 deg.. A gap or spacing s is designed between the blade and the bottom end of the rear baffle. The s is generally taken to be 0.5 to 5mm, preferably 0.7 to 3mm, preferably 1 to 2 mm.

The outer peripheral radius of the star wheel type activated carbon discharge roller (or the outer peripheral rotation radius of the blades on the round roller) is r. r is the radius of the cross section (circle) of the round roller (106a) + the width of the blade.

In general, the radius of the cross section (circle) of the round roll is 30 to 120mm, preferably 50 to 100mm, and the width of the blade is 40 to 130mm, preferably 60 to 100 mm.

The distance between the center of the round roller and the lower end of the front baffle is h, wherein h is generally larger than r + (12-30) mm but smaller than r/sin58 degrees, so that the smooth blanking of the activated carbon can be ensured, and the activated carbon can not automatically slide down when the round roller is not moved.

In general, in the present application, the cross section of the discharge opening of the star wheel type activated carbon discharge device is square or rectangular, preferably rectangular (or rectangular) with a length greater than a width. I.e., a rectangle (or rectangle) having a length greater than a width.

Preferably, the lower silo or bottom silo (H) of the adsorption column has one or more blow-down rotary valves.

For the rotary valve described here, a prior art rotary valve can be used. Preferably, however, a new rotary valve is used, which comprises: an upper feed port, a valve core, blades, a valve shell, a lower discharge port, a buffer area positioned in the upper space of an inner cavity of the valve and a leveling plate; the buffer area is adjacent to the lower space of the feed port and is communicated with the lower space of the feed port, and the length of the cross section of the buffer area in the horizontal direction is greater than that of the feed port in the horizontal direction; the material flattening plate is arranged in the buffer area, the upper end of the material flattening plate is fixed to the top of the buffer area, and the cross section of the material flattening plate in the horizontal direction is V-shaped.

Preferably, the upper feed inlet is rectangular or rectangular in cross-section and the buffer zone is rectangular or rectangular in cross-section.

Preferably, the length of the cross section of the buffer zone is smaller than the length of the cross section of the blade in the horizontal direction.

Preferably, the flat material plate is formed by splicing two single plates, or the flat material plate is formed by bending a plate into two plate surfaces.

Preferably, the included angle between the two single plates or the two plate surfaces is 2 alpha less than or equal to 120 degrees, and preferably 2 alpha less than or equal to 90 degrees. Thus, α ≦ 60 °, α ≦ 45 ° is preferred.

Preferably, the angle phi between each veneer or each plate surface and the length direction of the buffer zone is more than or equal to 30 degrees, preferably more than or equal to 45 degrees, and more preferably more than or equal to the friction angle of the activated carbon material.

Preferably, the bottom of each of the two single plates or the bottom of each of the two plate surfaces is in the shape of a circular arc.

Preferably, the length of the central line segment between the two single plates or the two plate surfaces is equal to or less than the width of the cross section of the buffer area in the horizontal direction.

Obviously, α + Φ is 90 °.

In general, in the present application, the cross-section of the discharge opening of the rotary valve is square or rectangular, preferably rectangular (or rectangular) with a length greater than the width. I.e., a rectangle (or rectangle) having a length greater than a width.

In general, the height of the main structure of the adsorption column is from 10 to 60m (meters), preferably from 12 to 55m (meters), preferably from 14 to 50m, preferably from 16 to 45m, from 18 to 40m, preferably from 20 to 35m, preferably from 22 to 30 m. The height of the main structure of the adsorption column means a height from an inlet to an outlet of the adsorption column (main structure). The height of the adsorption tower refers to the height from the active carbon outlet at the bottom of the adsorption tower to the active carbon inlet at the top of the adsorption tower, namely the height of the main structure of the tower.

The stripping or regeneration column, generally has a height of from 8 to 45m, preferably from 10 to 40m, more preferably from 12 to 35 m. The resolving tower typically has a length of 6-100 meters²Preferably 8-50 m²More preferably 10-30 m²Further preferably 15 to 20m²The cross-sectional area of the body.

Further, in the present application, the flue gas broadly includes: conventional industrial fumes or industrial waste gases.

Compared with the prior art, the efficient denitration ammonia injection system has the following beneficial technical effects:

1. according to the efficient denitration ammonia injection system, the second ammonia injection device is arranged at the lower part of the inner cavity of the adsorption tower, and ammonia is injected at two positions simultaneously, so that the denitration efficiency is improved, the utilization rate of ammonia is improved, and the efficient utilization of activated carbon is realized;

2. the flue at the downstream of the flue gas inlet is divided into two layers, the first ammonia injection device is arranged in the upper part of the flue, and the injected ammonia is used for the reaction of the upper layer of the adsorption tower; the second ammonia spraying device is arranged at the lower part of the inner cavity of the adsorption tower and is used for reaction of the lower layer of the adsorption tower, so that the desulfurization and denitrification effects are improved;

3. be equipped with the second in this application adsorption tower and spout the ammonia cavity, the ammonia device setting is spouted at the second in the ammonia cavity is spouted to the second, and the effectual ammonia cavity is spouted to the protection second.

4. Adopt the screen cloth that has the rectangle sieve mesh in the shale shaker, eliminated tablet active carbon and taken place the bridging phenomenon, detached the all very low tablet form active carbon of wear-resisting compressive strength under the screen, avoided producing piece and dust in SOx/NOx control device, reduced active carbon moving resistance, reduced the interior active carbon high temperature combustion risk of adsorption tower, let the active carbon of high strength recirculate in the device.

5. And a special discharging device is adopted, so that the discharging failure of the activated carbon is reduced, and the shutdown and maintenance frequency of the whole device is greatly reduced.

Drawings

FIG. 1 is a schematic diagram of a prior art ammonia injection system;

FIG. 2 is a schematic structural diagram of an efficient denitration ammonia injection system according to the present invention;

FIG. 3 is a schematic diagram of another design structure of the high-efficiency denitration ammonia injection system.

Fig. 4 is a schematic diagram of a prior art screen.

Fig. 5 is a schematic diagram of the structure of a screen of the present application.

FIG. 6 is a schematic view of a tablet-like activated carbon.

Fig. 7 is a schematic view of a long activated carbon strip.

Fig. 8 and 9 are schematic views of an activated carbon discharge device (round roll feeder) of the prior art.

Fig. 10 is a schematic view of a star wheel activated carbon discharge device of the present application.

Fig. 11 is a schematic view of a rotary valve F of the present invention.

Fig. 12 and 13 are schematic structural views of a cross section taken along line a-a of fig. 11.

Fig. 14 is a schematic structural view of the flat material plate (F07).

Reference numerals:

1: an adsorption tower; 101: the upper part of the flue; 102: the lower part of the flue; 103: a second ammonia injection chamber; 2: a resolution tower; 3: an ammonia gas mixing device; 301: an ammonia gas inlet; 302: an air inlet; 303: a mixed gas outlet; 4: a first activated carbon delivery device; 5: a second activated carbon delivery device; 601: a first ammonia injection device; 602: a second ammonia injection device; l1: a first delivery conduit; l2: a second delivery conduit; l3: an ammonia gas delivery line; l4: an air delivery conduit; a: a flue gas inlet; b: a flue gas outlet; v1: a first control valve; v2: a second control valve. Sv: vibrating screen;

AC-c: an activated carbon material chamber; h: a discharge hopper or bottom bin; AC: activated carbon; AC-1: activated carbon agglomerates (or aggregates); f: rotating the valve;

g: a circular roller feeder or a star wheel type active carbon discharging device or a star wheel type active carbon discharging roller; g01: a round roller; g02: a blade; AC-I: a front baffle; AC-II: a tailgate;

h: the distance between the shaft center of the round roller G01 and the lower end of the front baffle AC-I; s: (gap) spacing between the vanes and the bottom end of the backplate; θ: the included angle between adjacent blades G02 on the round roller G01; r: the distance between the outer edge of the vane and the axial center of the round roller G01 (i.e., the radius of the vane with respect to the center of the round roller G01, referred to as the radius);

f: a feed rotary valve; f01: a valve core; f02: a blade; f03: a valve housing; f04: an upper feed port; f05: a lower discharge port; f06 buffer zone located in the upper space of the inner cavity of the valve; f07: flattening the material plate; f0701 or F0702: two single plates of the flat material plate F07 or two plate surfaces of the flat material plate F07.

α: 1/2 of the included angle of two veneers (F0701, F0702) or two plate surfaces (F0701, F0702).

Phi: the included angle between each veneer (F0701 or F0702) or each plate surface (F0701 or F0702) and the length direction of the buffer area (F06).

L1: the length of the cross section of the feed opening F04 in the horizontal plane direction; l2: the length of the cross section of the flat material plate F07 in the horizontal plane direction.

Detailed Description

The utility model provides an ammonia system is spouted in high-efficient denitration, this system include adsorption tower 1, analytic tower 2, ammonia gas mixing arrangement 3, first active carbon conveyor 4, second active carbon conveyor 5, first pipeline L1, second pipeline L2. One side of the adsorption tower 1 is provided with a flue gas inlet A. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The flue gas inlet A is provided with a first ammonia injection device 601. The lower part of the inner cavity of the adsorption tower 1 is provided with a second ammonia spraying device 602. The ammonia gas mixing device 3 includes an ammonia gas inlet 301, an air inlet 302, and a mixed gas outlet 303. The first transfer line L1 connects the mixed gas outlet 303 and the first ammonia injection device 601. The second delivery pipe L2 connects the mixed gas outlet 303 and the second ammonia injection device 602. The ammonia gas inlet 301 is connected to an ammonia gas delivery line L3. The air inlet 302 is connected to an air delivery duct L4 or is open to the atmosphere. The first active carbon conveyor 4 is used for connecting the discharge hole of the adsorption tower 1 and the feed inlet of the desorption tower 2. The second active carbon conveyor 5 is used for connecting the discharge hole of the desorption tower 2 and the feed inlet of the adsorption tower 1.

Preferably, the flue gas inlet a is downstream of the flue gas inlet a. The flue downstream of the flue gas inlet a is divided into two layers. Respectively, a flue upper part 101 and a flue lower part 102. The first ammonia injection device 601 is arranged in the flue upper part (101).

Preferably, a second ammonia injection chamber 103 is arranged in the adsorption tower 1. In the vertical direction, the second ammonia injection chamber 103 is located at the lower portion in the adsorption tower 1. Preferably, the second ammonia injection chamber 103 is close to the side of the flue gas outlet B in the horizontal direction.

Preferably, the side wall of the second ammonia injection chamber 103 is a porous plate. The second ammonia injection device 602 is arranged in the second ammonia injection chamber 103.

Preferably, the height of the second ammonia injection chamber 103 is flush with the top of the lower flue part 102 in the vertical direction, or the top of the second ammonia injection chamber 103 is lower than the top of the lower flue part 102.

Preferably, the first delivery pipe L1 is provided with a first control valve V1.

Preferably, a second control valve V2 is provided on the second delivery pipe L2.

Preferably, the second conveying pipe L2 branches off from the first conveying pipe L1. One end of the second conveying pipeline L2 is connected with the first conveying pipeline L1, and the other end of the second conveying pipeline L2 is connected with the second ammonia spraying device 602.

In the present invention, the ammonia injection amount of the second ammonia injection device 602 is 10 to 60%, preferably 20 to 50%, more preferably 25 to 40% of the ammonia injection amount of the first ammonia injection device 601.

In the invention, the mixed gas passing through the ammonia mixing device 3 is conveyed into the adsorption tower through two paths. The first path of mixed gas is conveyed to the first ammonia spraying device 601 at the flue gas inlet a through a first conveying pipeline L1, and ammonia is sprayed at the raw flue gas inlet. The partial ammonia gas mainly enters the upper layer of the adsorption tower and reacts with the active carbon on the upper layer of the adsorption tower, so that the effect of treating pollutants such as oxysulfide, nitric oxide, dioxin and the like is improved. The second path of mixed gas is conveyed to the second ammonia injection device 602 at the lower part of the inner cavity of the adsorption tower 1 through a second conveying pipeline L2, and ammonia is injected at the lower part of the adsorption tower and is directly injected into the adsorption tower. The partial ammonia gas completely enters the lower layer of the adsorption tower (preferably enters an activated carbon layer at the position of the adsorption tower close to the flue gas outlet B) to react with the activated carbon at the lower layer of the adsorption tower, so that the effect of treating pollutants such as oxysulfide, nitric oxide, dioxin and the like is improved.

In all the high-efficiency denitration ammonia injection systems (or called desulfurization and denitration systems) of the application, generally, a vibrating screen or a multi-stage sieving machine (or a multi-stage vibrating screen) provided with a screen is used below or downstream of a bottom discharge port of a desorption tower.

In order to avoid the entrapment of the tablet-shaped active carbon on the screen, the screen with rectangular or elongated screen holes is designed. The screen can be arranged on a vibrating screen or a multi-stage screening machine (or a multi-stage vibrating screen) to screen out the activated carbon particles meeting the requirements of a desulfurization ammonia spraying system.

In particular, in order to overcome the problems of the prior art encountered in desulfurization ammonia injection systems, it is generally required that the minimum value h of the activated carbon cylinder length is in the range of 1.5mm to 7 mm. For

example h

2, 4 or 6 mm.

D (or

Example A

As shown in FIG. 5, the size (screen cut-off) of the finished activated carbon recycled in the desulfurization ammonia injection system is required to be

(diameter, D) × 6mm (length, h), a screen is designed for use in a layer of screen of a vibrating screen 3, wherein the width a and length L of the rectangular mesh are: 5mm (width a). times.27 mm (length L). Where D is the diameter of the circular cross-section of the cylinder of activated carbon to be retained on the screen and h is the minimum length of the cylinder of granular activated carbon to be retained on the screen. and a is 0.833 h.

Example B

(diameter, D). times.4 mm (length, h), a screen is designed for use in a layer of screen of a vibrating screen 3, wherein the width a of the rectangular screen hole and the width h of the rectangular screen holeThe length L is: 3mm (width a) × 27mm (length L). Where D is the diameter of the circular cross-section of the cylinder of granular activated carbon to be retained on the screen. and a is 0.75 h. The mesh size screen is used to retain medium particle size activated carbon.

Example C

(diameter, D) × 2mm (average length), a screen is designed for use in a layer of screen of a vibrating screen 3, wherein the width a and length L of the rectangular openings are: 1.6mm (width a). times.16 mm (length L). Where D is the diameter of the circular cross-section of the cylinder of granular activated carbon to be retained on the screen. and a is 0.75 h.

The adsorption column generally has at least 2 activated carbon compartments.

Preferably, there is one round roller feeder or discharge round roller G at the bottom of each activated carbon chamber AC-c of the adsorption tower. Typically, the adsorption column has at least two activated carbon compartments AC-c.

For the circular roller feeder or discharge circular roller G described here, a circular roller feeder or discharge circular roller G of the prior art can be used, as shown in fig. 8 and 9. However, it is preferable to use a new star wheel type activated carbon discharging device G as shown in fig. 10 instead of the circular roller feeder or the discharging circular roller G. Novel star wheel formula active carbon discharge device G includes: a front baffle AC-I and a rear baffle AC-II at the lower part of the activated carbon material chamber, and a star wheel type activated carbon discharging roller G positioned below a discharging opening formed by the front baffle AC-I and the rear baffle AC-II at the lower part of the activated carbon material chamber and two side plates; wherein the star wheel type activated carbon discharging roller G comprises a round roller G01 and a plurality of blades G02 which are distributed along the circumference of the round roller at equal angles or basically at equal angles. More specifically, a novel star wheel type active carbon discharging roller G is used below a discharging opening formed by a front baffle plate AC-I and a rear baffle plate AC-II at the lower part of an active carbon material chamber and two side plates. That is, a star wheel type activated carbon discharging roller (G) is installed at the bottom of each material chamber of the lower activated carbon bed layer part (A) or below a discharging opening formed by a front baffle (AC-I) and a rear baffle (AC-II) and two side plates of the lower part of the activated carbon material chamber.

The star wheel type activated carbon discharging roller G has a star wheel type configuration or appearance when viewed from the cross section.

In addition. The novel star wheel type active carbon discharging device can also be called a star wheel type active carbon discharging roller G for short, or the star wheel type active carbon discharging roller G and the star wheel type active carbon discharging roller G can be used interchangeably.

The star wheel type active carbon blanking device mainly comprises a front baffle AC-I and a rear baffle AC-II of an active carbon discharge opening, two side plates, a blade G02 and a round roller G01. The front baffle and the rear baffle are fixedly arranged, an active carbon blanking channel, namely a discharge opening, is reserved between the front baffle and the rear baffle, and the discharge opening is composed of a front baffle AC-I, a rear baffle AC-II and two side plates. The round rollers are arranged at the lower ends of the front baffle plate AC-I and the rear baffle plate AC-II, the blades G02 are uniformly distributed and fixed on the round rollers G01, the round rollers G01 are driven by a motor to rotate, and the rotating direction is from the rear baffle plate AC-II to the front baffle plate AC-I. The angle or pitch between the vanes G02 should not be too large, and the angle θ between the vanes is typically designed to be less than 64 °, e.g., 12-64 °, preferably 15-60 °, preferably 20-55 °, more preferably 25-50 °, more preferably 30-45 °. A gap or spacing s is designed between the blade and the bottom end of the rear baffle. The s is generally taken to be 0.5 to 5mm, preferably 0.7 to 3mm, preferably 1 to 2 mm.

The outer peripheral radius of the star wheel type activated carbon discharge roller G (or the outer peripheral radius of rotation of the blades on the round roller) is r. r is the radius of the cross section (circle) of the round roller G01 + the width of the blade G02.

In general, the radius of the cross section (circle) of the round roller G01 is 30-120mm, and the width of the blade G02 is 40-130 mm.

Preferably, the lower bin or bottom bin 107 of the adsorption column has one or more blowdown rotary valves F.

For the rotary valve F described here, a prior art rotary valve can be used, as shown in FIG. 8. However, it is preferred to use a new rotary valve F, as shown in FIGS. 11-14. The novel rotary valve F comprises: an upper feed port F04, a valve core F01, a blade F02, a valve shell F03, a lower discharge port F05, a buffer area F06 positioned in the upper space of an inner cavity of the valve, and a flat plate F07; wherein the buffer zone F06 is adjacent to the lower space of the feed port F04 and communicated with each other, and the length of the cross section of the buffer zone F06 in the horizontal direction is larger than that of the feed port F04 in the horizontal direction; the material leveling plate is arranged in the buffer area F06, the upper end of the material leveling plate F07 is fixed at the top of the buffer area F06, and the cross section of the material leveling plate F07 in the horizontal direction is V-shaped.

Preferably, the cross section of the upper feed port F04 is rectangular or rectangular, and the cross section of the buffer zone F06 is rectangular or rectangular.

Preferably, the length of the cross section of the buffer zone F06 is smaller than the length of the cross section of the vane F02 in the horizontal direction.

Preferably, the flat material plate F07 is formed by splicing two single plates (F0701, F0702), or the flat material plate F07 is formed by bending one plate into two plate surfaces (F0701, F0702).

Preferably, the included angle 2 alpha of the two single plates (F0701, F0702) or the two plate surfaces (F0701, F0702) is less than or equal to 120 degrees, and preferably, the included angle 2 alpha is less than or equal to 90 degrees. Thus, α ≦ 60 °, α ≦ 45 ° is preferred.

Preferably, the angle phi between each veneer (F0701 or F0702) or each plate surface (F0701 or F0702) and the length direction of the buffer zone F06 is more than or equal to 30 degrees, preferably more than or equal to 45 degrees, and more preferably more than or equal to the friction angle of the activated carbon material.

Preferably, the bottom of each of the two veneers (F0701, F0702) or the bottom of each of the two faces (F0701, F0702) is circular.

Preferably, the length of the central line segment between the two veneers (F0701, F0702) or the two plate surfaces (F0701, F0702) is equal to or less than the width of the cross section of the buffer area F06 in the horizontal direction.

Obviously, α + Φ is 90 °.

In general, in the present application, the discharge port F05 of the novel rotary valve F has a square or rectangular cross-section, preferably a rectangular (or rectangular) shape with a length greater than a width. I.e., a rectangle (or rectangle) having a length greater than a width.

Example 1

The adsorption column 1 has two activated carbon chambers AC-c as shown in fig. 8. The discharge port of each material chamber AC-c is provided with a circular roller feeder G. The discharge hole of the discharging hopper or the bottom bin H is provided with a rotary valve F. Preferably, a vibrating screen Sv is arranged below the discharge opening of the resolution tower 2, wherein the vibrating screen Sv is provided with the screen mesh of the embodiment a, see fig. 2.

Example 2

Example 1 was repeated except that downstream of the flue gas inlet a was a flue. The flue downstream of the flue gas inlet a is divided into two layers. Respectively, a flue upper part 101 and a flue lower part 102. The first ammonia injection device 601 is disposed in the flue upper portion 101. A second ammonia injection chamber 103 is arranged in the adsorption tower 1. In the vertical direction, the second ammonia injection chamber 103 is located at the lower part in the adsorption tower 1, and in the horizontal direction, the second ammonia injection chamber 103 is close to one side of the flue gas outlet B. The side wall of the second ammonia spraying chamber 103 is a porous plate. The second ammonia injection device 602 is arranged in the second ammonia injection chamber 103. The second ammonia injection chamber 103 is at a level flush with the top of the lower flue portion 102.

Example 3

Example 2 was repeated except that the top of the second ammonia injection chamber 103 was 20cm below the top of the lower flue portion 102.

Example 4

Example 2 was repeated except that the second delivery conduit L2 branched off the first delivery conduit L1. One end of the second conveying pipeline L2 is connected with the first conveying pipeline L1, and the other end of the second conveying pipeline L2 is connected with the second ammonia spraying device 602. The first delivery pipe L1 is provided with a first control valve V1. The second delivery pipe L2 is provided with a second control valve V2.

Example 5

Using the method of example 4, the mixed gas after passing through the ammonia mixing device 3 was sent to the adsorption tower through two paths. The first path of mixed gas is conveyed to the first ammonia spraying device 601 at the flue gas inlet a through a first conveying pipeline L1, and ammonia is sprayed at the raw flue gas inlet. The partial ammonia gas mainly enters the upper layer of the adsorption tower and reacts with the active carbon on the upper layer of the adsorption tower, so that the effect of treating pollutants such as oxysulfide, nitric oxide, dioxin and the like is improved. The second path of mixed gas is conveyed to the second ammonia injection device 602 at the lower part of the inner cavity of the adsorption tower 1 through a second conveying pipeline L2, and ammonia is injected at the lower part of the adsorption tower and is directly injected into the adsorption tower. The partial ammonia gas completely enters the lower layer of the adsorption tower (preferably enters an activated carbon layer at the position of the adsorption tower close to the flue gas outlet B) to react with the activated carbon at the lower layer of the adsorption tower, so that the effect of treating pollutants such as oxysulfide, nitric oxide, dioxin and the like is improved.

Wherein: the ammonia injection amount of the second ammonia injection device 602 is 30% of the ammonia injection amount of the first ammonia injection device 601.

The ammonia spraying denitration efficiency of the upper part of an adsorption tower used in the prior art is about 40 percent; with the system of the present application, after a small amount of ammonia was injected in the lower portion (about 30% of the amount of ammonia injected in the upper portion), the denitrification rate of the system increased to about 50%.

In the above embodiment, the vibrating screen Sv with the specific screen is used to replace the ordinary vibrating screen below the discharge port of the desorption tower 2, so that the bridging phenomenon of the tablet activated carbon is eliminated, the tablet-shaped activated carbon with low wear-resistant and pressure-resistant strength is removed under the screen, the generation of fragments and dust in the desulfurization and denitrification device is avoided, the moving resistance of the activated carbon is reduced, the high-temperature combustion risk of the activated carbon in the adsorption tower is reduced, the recycling of the high-strength activated carbon in the device is realized, the screen blanking of the vibrating screen is reduced, and the operating cost is reduced.

Example 6

Example 1 was repeated except that a new star wheel type activated carbon discharging device was used instead of the discharging roller G, as shown in fig. 10. The bottom of an active carbon material chamber is provided with 1 discharge port. The discharge opening is formed by a front baffle AC-I and a back baffle AC-II and two side plates (not shown in the figure).

The height of the main structure of the adsorption column was 21m (meters). The adsorption column 1 has 2 activated carbon chambers. Wherein the thickness of the first chamber on the left is 180 mm. The thickness of the second chamber on the right is 900 mm.

Star wheel formula active carbon discharge device includes: a front baffle AC-I and a rear baffle AC-II at the lower part of the activated carbon material chamber, and a star wheel type activated carbon discharging roller G positioned below a discharging opening formed by the front baffle AC-I and the rear baffle AC-II at the lower part of the activated carbon material chamber and two side plates; the star wheel type active carbon discharging roller G comprises a round roller G01 and 12 blades G02 which are distributed along the circumference of the round roller at equal angles (theta is 30 degrees).

The star wheel type activated carbon discharging roller G is in a star wheel type configuration when viewed from the cross section.

The discharge opening is composed of a front baffle plate AC-I, a rear baffle plate AC-II and two side plates. The round rollers are arranged at the lower ends of the front baffle plate AC-I and the rear baffle plate AC-II, the blades G02 are uniformly distributed and fixed on the round rollers G01, the round rollers G01 are driven by a motor to rotate, and the rotating direction is from the rear baffle plate AC-II to the front baffle plate AC-I. The angle θ between the vanes G02 was 30 °. A gap or spacing s is designed between the blade and the bottom end of the rear baffle. This s is taken to be 2 mm.

The radius of the cross section (circle) of the round roller G01 was 60mm, and the width of the blade G02 was 100 mm.

Example 7

Example 2 was repeated except that a new star wheel type activated carbon discharging device was used instead of the discharging roller G, as shown in fig. 10. The bottom of an active carbon material chamber is provided with 1 discharge port. The discharge opening is formed by a front baffle AC-I and a back baffle AC-II and two side plates (not shown in the figure).

The height of the main structure of the adsorption column was 21m (meters). The thickness of the first chamber on the left is 160 mm. The thickness of the second chamber on the right is 1000 mm.

Star wheel formula active carbon discharge device includes: a front baffle AC-I and a rear baffle AC-II at the lower part of the activated carbon material chamber, and a star wheel type activated carbon discharging roller G positioned below a discharging opening formed by the front baffle AC-I and the rear baffle AC-II at the lower part of the activated carbon material chamber and two side plates; the star wheel type active carbon discharging roller G comprises a round roller G01 and 8 blades G02 which are distributed along the circumference of the round roller at equal angles (theta is 45 degrees).

The discharge opening is composed of a front baffle plate AC-I, a rear baffle plate AC-II and two side plates. The round rollers are arranged at the lower ends of the front baffle plate AC-I and the rear baffle plate AC-II, the blades G02 are uniformly distributed and fixed on the round rollers G01, the round rollers G01 are driven by a motor to rotate, and the rotating direction is from the rear baffle plate AC-II to the front baffle plate AC-I. The angle θ between the vanes G02 was 45 °. A gap or spacing s is designed between the blade and the bottom end of the rear baffle. This s is taken to be 1 mm.

The outer peripheral radius of the star wheel type activated carbon discharge roller G is r. r is the radius of the cross section (circle) of the round roller G01 + the width of the blade G02.

The radius of the cross section (circle) of the round roller G01 was 90mm, and the width of the blade G02 was 70 mm.

Example 8

Example 2 was repeated except that instead of the normal blow-down rotary valve F a new blow-down rotary valve F was used, as shown in fig. 11-14.

The novel rotary valve F comprises: an upper feed port F04, a valve core F01, a vane F02, a valve housing F03, a lower discharge port F05, a buffer zone F06 located in an upper space of an inner cavity of the valve, and a flat plate F07. Wherein the buffer zone F06 is adjacent to the lower space of the feed port F04 and communicated with each other, and the length of the cross section of the buffer zone F06 in the horizontal direction is larger than that of the feed port F04 in the horizontal direction; the material leveling plate is arranged in the buffer area F06, the upper end of the material leveling plate F07 is fixed at the top of the buffer area F06, and the cross section of the material leveling plate F07 in the horizontal direction is V-shaped.

The upper feed port F04 is rectangular in cross section, and the buffer zone F06 is also rectangular in cross section.

The length of the cross section of the buffer zone F06 is smaller than the length of the cross section of the vane F02 in the horizontal direction.

The flat material plate F07 is formed by splicing two single plates (F0701, F0702).

The included angle 2 alpha of the two single plates (F0701 and F0702) is 90 degrees.

Preferably, the angle Φ between each single plate (F0701 or F0702) or each plate surface (F0701 or F0702) and the length direction of the buffer zone F06 is 30 °. Ensure that phi is larger than the friction angle of the activated carbon material.

The bottoms of the two veneers (F0701, F0702) are arc-shaped.

The length of a central line segment between two single plates (F0701, F0702) or two plate surfaces (F0701, F0702) is slightly smaller than the width of the cross section of the buffer area F06 in the horizontal direction.

α+Φ＝90°。

The outer peripheral radius of rotation of the blades of the rotary valve is r. r is the radius of the cross section (circle) of the spool F01 + the width of the vane F02.

Valve core F01) has a radius of 30mm in cross section (circle) and a width of 100mm in the vane F02. I.e. r is 130 mm.

The length of the blade F02 is 380 mm.

Example 9

Example 7 was repeated except that instead of the normal blow-down rotary valve F, a new blow-down rotary valve F was used, as shown in fig. 11-14.

The rotary valve F comprises: an upper feed port F04, a valve core F01, a vane F02, a valve housing F03, a lower discharge port F05, a buffer zone F06 located in an upper space of an inner cavity of the valve, and a flat plate F07. Wherein the buffer zone F06 is adjacent to the lower space of the feed port F04 and communicated with each other, and the length of the cross section of the buffer zone F06 in the horizontal direction is larger than that of the feed port F04 in the horizontal direction; the material leveling plate is arranged in the buffer area F06, the upper end of the material leveling plate F07 is fixed at the top of the buffer area F06, and the cross section of the material leveling plate F07 in the horizontal direction is V-shaped.

The bottoms of the two veneers (F0701, F0702) are arc-shaped.

α+Φ＝90°。

The length of the blade F02 is 380 mm.

Claims

1. An efficient denitration ammonia injection system comprises an adsorption tower (1), a desorption tower (2), an ammonia gas mixing device (3), a first activated carbon conveying device (4), a second activated carbon conveying device (5), a first conveying pipeline (L1) and a second conveying pipeline (L2); a flue gas inlet (A) is formed in one side of the adsorption tower (1), and a flue gas outlet (B) is formed in the other side of the adsorption tower (1); the flue gas inlet (A) is provided with a first ammonia spraying device (601), the lower part of the inner cavity of the adsorption tower (1) is provided with a second ammonia spraying device (602), the ammonia mixing device (3) comprises an ammonia inlet (301), an air inlet (302) and a mixed gas outlet (303), a first conveying pipeline (L1) is connected with the mixed gas outlet (303) and the first ammonia spraying device (601), and a second conveying pipeline (L2) is connected with the mixed gas outlet (303) and the second ammonia spraying device (602); the ammonia inlet (301) is connected with an ammonia conveying pipeline (L3), and the air inlet (302) is connected with an air conveying pipeline (L4) or communicated with the atmosphere; the first active carbon conveying device (4) is used for connecting a discharge hole of the adsorption tower (1) and a feed inlet of the desorption tower (2); the second active carbon conveying device (5) is used for connecting a discharge hole of the desorption tower (2) and a feed inlet of the adsorption tower (1);

wherein: the downstream of the flue gas inlet (A) is a flue, the flue at the downstream of the flue gas inlet (A) is divided into two layers, namely a flue upper part (101) and a flue lower part (102), and the first ammonia spraying device (601) is arranged in the flue upper part (101); a second ammonia spraying chamber (103) is arranged in the adsorption tower (1), and a second ammonia spraying device (602) is arranged in the second ammonia spraying chamber (103); in the vertical direction, the height of the second ammonia injection chamber (103) is flush with the top of the lower flue part (102), or the top of the second ammonia injection chamber (103) is lower than the top of the lower flue part (102).

2. The system of claim 1, wherein: in the vertical direction, the second ammonia injection chamber (103) is positioned at the lower part in the adsorption tower (1).

3. The system of claim 2, wherein: in the horizontal direction, the second ammonia spraying chamber (103) is close to one side of the flue gas outlet (B).

4. The system of claim 3, wherein: the side wall of the second ammonia spraying chamber (103) is a porous plate.

5. The system according to any one of claims 1-4, wherein: the first conveying pipeline (L1) is provided with a first control valve (V1) and/or

The second conveying pipeline (L2) is provided with a second control valve (V2).

6. The system of claim 5, wherein: the second conveying pipeline (L2) is a branch of the first conveying pipeline (L1), one end of the second conveying pipeline (L2) is connected with the first conveying pipeline (L1), and the other end of the second conveying pipeline (L2) is connected with the second ammonia spraying device (602).

7. The system according to any one of claims 1-4, wherein: the ammonia injection amount of the second ammonia injection device (602) is 10-60% of the ammonia injection amount of the first ammonia injection device (601).

8. The system of claim 7, wherein: the ammonia injection amount of the second ammonia injection device (602) is 20-50% of the ammonia injection amount of the first ammonia injection device (601).

9. The system of claim 8, wherein: the ammonia injection amount of the second ammonia injection device (602) is 25-40% of the ammonia injection amount of the first ammonia injection device (601).

10. The system according to any one of claims 1-4, 6, 8, 9, wherein below or downstream of the bottom outlet of the desorption column (2) is used a vibrating screen (Sv) equipped with a screen having oblong holes with a length L ≧ 3D and a width a ═ 0.65h-0.95h, where D is the diameter of the circular cross section of the cylinder of activated carbon to be retained on the screen and h is the minimum value of the length of the cylinder of granular activated carbon to be retained on the screen.

11. The system according to claim 10, wherein below or downstream of the bottom outlet of the resolution tower (2) is used a vibrating screen (Sv) equipped with a screen having rectangular mesh with a length L ≥ 3D and a width a ═ 0.7h-0.9h, where h ═ 1.5mm-7 mm; the diameter D of the circular cross section of the activated carbon cylinder is 4.5-9.5 mm.

12. The system of claim 11, wherein the width a of the rectangular mesh is 0.73h to 0.85 h; the diameter D of the circular cross section of the activated carbon cylinder is 5-9 mm.

13. The system according to any one of claims 1 to 4, 6, 8, 9, 11 to 12, wherein the adsorption tower (1) has at least 2 activated carbon material chambers (AC-c), and a star wheel type activated carbon discharging roller (G) comprising a round roller (G01) and a plurality of blades (G02) equiangularly distributed along the circumference of the round roller is installed at the bottom of each activated carbon material chamber (AC-c) or below a discharging port formed by a front baffle (AC-I) and a rear baffle (AC-II) and two side plates at the lower portion of the activated carbon material chamber.

14. System according to claim 13, wherein a circular roller (G01) is arranged at the lower end of the front flap (AC-I) and the rear flap (AC-II), the angle θ between the blades (G02) distributed over the circumference of the circular roller (G01) being 12-64 °.

15. The system according to claim 14, wherein the angle θ between the blades (G02) distributed over the circumference of the circular roller (G01) is 15-60 °.

16. The system according to claim 14, wherein the angle θ between the blades (G02) distributed over the circumference of the circular roller (G01) is 20-55 °.

17. The system according to any one of claims 14-16, wherein the spacing s between the vanes (G02) on the circumference of the round roller (G01) and the bottom end of the tailgate is 0.5-5 mm; and/or

The radius of the cross section of the round roller (G01) is 30-120mm, and the width of the blade (G02) on the circumference of the round roller (G01) is 40-130 mm.

18. The system of claim 17, wherein the spacing s between the vanes (G02) on the circumference of the round roller (G01) and the bottom end of the tailgate is 0.7-3 mm.

19. The system of claim 17, wherein the spacing s between the vanes (G02) on the circumference of the round roller (G01) and the bottom end of the tailgate is 1-2 mm.

20. The system according to any one of claims 1-4, 6, 8, 9, 11-12, 14-16, 18-19, wherein the lower silo or bottom silo (H) of the adsorption column has one or more blowdown rotary valves (F) comprising: an upper feed port (F04), a valve core (F01), a blade (F02), a valve shell (F03), a lower discharge port (F05), a buffer area (F06) positioned in the upper space of an inner cavity of the valve, and a material balancing plate (F07); wherein the buffer zone (F06) is adjacent to and communicated with the lower space of the feed port (F04), and the length of the cross section of the buffer zone (F06) in the horizontal direction is larger than that of the feed port (F04); the flat material plate is arranged in the buffer area (F06), the upper end of the flat material plate (F07) is fixed at the top of the buffer area (F06), and the cross section of the flat material plate (F07) in the horizontal direction is V-shaped.

21. The system of claim 20, wherein the cross-section of the upper feed opening (F04) is rectangular and the cross-section of the buffer zone (F06) is rectangular; and/or

The length of the cross section of the buffer zone (F06) is smaller than that of the cross section of the blade (F02) in the horizontal direction.

22. The system according to claim 21, wherein the flat material plate (F07) is formed by splicing two single plates (F0701, F0702), or the flat material plate (F07) is formed by bending one plate into two plate surfaces (F0701, F0702), and the included angle 2 α of the two single plates (F0701, F0702) or the two plate surfaces (F0701, F0702) is less than or equal to 120 °, namely, α is less than or equal to 60 °.

23. A system according to claim 22, wherein the angle Φ between each veneer (F0701 or F0702) or each board side (F0701 or F0702) and the length direction of the buffer zone (F06) is ≥ 30 °; and/or

Wherein the bottoms of the two veneers (F0701, F0702) or the bottoms of the two plate surfaces (F0701, F0702) are arc-shaped.

24. The system of claim 23, wherein the angle Φ between each veneer (F0701 or F0702) or each plate face (F0701 or F0702) and the length direction of the buffer zone (F06) is greater than or equal to the friction angle of the activated carbon material.